[...]

Christiane Amanpour, CNN: It is generally accepted by Europe, by your partners in Russia and elsewhere, China, and the current U.S. administration that the Iran nuclear deal was a beneficial foreign policy achievement for all of you world powers.  Donald Trump has threatened to tear it up, calling it the worst deal.  Can he?  Is this something that a U.S. President can do unilaterally?

EU High Representative Federica Mogherini: The Iranian deal, the nuclear deal, is not a bilateral agreement between the U.S. and Iran.  It’s a multilateral agreement that we have negotiated.  I have a personal, direct responsibility as, still, the chair of the Joint Commission that supervises the implementation of the agreement, to guarantee that it is fully implemented by all sides – all sides.  And this is enframed into a U.N. Security Council resolution, actually more than one.  So it is not bilateral or unilateral issue, it is a multilateral agreement in the framework of the United Nations.

[...]